soheil_hooshdaran wrote:How come White didn't take the Rook?
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I would suspect the game has been incorrectly input. The names sound American, so it is possible the game was originally published in Descriptive notation. As recorded the moves Rxb2 and Rxg2 were played in succession. Although you are supposed to record in descriptive as RxQNP and RxKNP, if they had been recorded as RxNP, that's how the ambiguity might arise.

It's plausible then, that the moves were played in the order Rxg2 and Rxb2, which anyway looks a more logical way the play the position.

soheil_hooshdaran wrote:What advantage does White have in:
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Space presumably, the position looking as if it had arisen from the Old Benoni. That said, Black's Bishop pair might one day become useful. It's White's game to lose as apart from playing .. f5 or .. b5, there's not so much that Black can do, other than to react to threats. If it's White to play, you look at making f5 work.Alternatively you look at the consequences of bxc5 and an invasion attempt on the Queen side.

soheil_hooshdaran wrote:Here Chess Life just gives: 17...g6?! 18.Bh6! why?
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I've learned to my cost that if you trade dark square Bishops in that type of Spanish position, that combinations with Nf5 can be very dangerous. But you may had to to play 17. .. g6 to defend against the Nf1-g3-f5 idea. If possible play .. g6 when there's a Knight on d2. That way you can get the Bishop to g7 via f6 or f8 without allowing Bh6.